関連する実験動画
Updated: May 11, 2026

09:16
Oligopeptide Competition Assay for Phosphorylation Site Determination
Published on: May 18, 2017
まとめ
循環性アデノシンモノフォスファート (cAMP) 依存キナーゼは,骨格筋の中間線維タンパク質であるデスミンとヴィメンチンをリン酸化する. これらのキナーゼは,筋肉細胞の構造と機能を調節するために不可欠です.
科学分野:
- バイオケミストリー バイオケミストリー
- 細胞生物学 細胞生物学
- 筋肉生理学 筋肉生理学
背景:
- デスミンやヴィメンチンのような中間線維タンパク質は,骨格筋の構造に不可欠です.
- リン酸化は,タンパク質の機能を調節する重要な翻訳後の修正である.
- 筋肉細胞におけるデスミンとヴィメンチンのリン酸化に関与する特定のキナーゼは,完全に解明されていません.
研究 の 目的:
- 骨格筋におけるデスミンとヴィメンチンのリン酸化を担当するタンパク質キナーゼを特定し,特徴づけること.
- このリン酸化過程におけるサイクルアデノシンモノフォスファート (cAMP) 依存キナーゼの役割を調査する.
- デスミンとヴィメンチンのリン酸化パターンをin vitroとin vivoで比較する.
主な方法:
- 成熟したニワトリの骨格筋からデスミンキナーゼの活性を浄化する.
- 浄化されたcAMP依存タンパク質キナーゼの生化学的特徴.
- 精製された触媒サブユニットと細胞骨格基板を用いたインビトロリン酸化試験.
- トリプティックペプチド分析により,リン酸化デスミン.
主要な成果:
- 鶏肉の骨格筋におけるデスミンキナーゼの活動は,cAMP依存キナーゼとして特定されました.
- 鶏,ウサギ,牛のソースからCAMP依存キナーゼの浄化された触媒サブユニット in vitroで酸化デスミンとヴィメンチン.
- ウサギの骨格筋キナーゼによるデスミンとヴィメンチンのリン酸化は,その調節サブユニットとcAMPによって調節された.
- In vivo リン酸化されたデスミンは,2つの主要なフォスホペプチドを示し,どちらも牛の心臓キナーゼによって in vitro でリン酸化され,追加のサイトが示されました.
結論:
- cAMP依存キナーゼは,骨格筋におけるデスミンとヴィメンチンのリン酸化を担当する主要な酵素である.
- これらの中間繊維のリン酸化は,cAMPレベルによって調節されます.
- このリン酸化機構を理解することで,筋肉細胞構造の動的調節に関する洞察が得られます.
さらに関連する動画
12:26Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
08:07Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
Published on: July 26, 2019
関連する概念動画
Phosphorylation
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
Actin Polymerization
Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶ nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight actin...
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight actin...
Mechanism of Filopodia Formation
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Disassembly of Intermediate Filaments
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...